Overnight the United States lost the support of its closest ally. The British parliament voted against taking any military action against Syria.

"It is clear to me that the British Parliament, reflecting the views of the British people, does not want to see British military action," Prime Minister David Cameron said. "I get that and the government will act accordingly."

The U.S. may be able to act in coordination with France, whose president says that Syria must be punished.

If the U.S. strikes, it will not have any formal support from the U.N. That's because Russia blocked efforts to pass a resolution authorizing the use of force.

Meanwhile, U.N. chemical weapons experts are on the ground in Syria, hoping to determine whether or not chemical weapons were used. Experts believe their evidence could also help to discover just who deployed the gases.